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# File 'lib/backframe/activerecord/acts_as_orderable.rb', line 13
def acts_as_orderable(field, args = {})
class_eval <<-EOV
validates_presence_of :#{field}
before_validation :set_#{field}, :on => :create
after_destroy :reorder_#{field}
default_scope -> { order(:#{field} => :asc) }
def set_#{field}
self.#{field} ||= (self.#{args[:on]}.#{self.name.tableize}.any?) ? self.#{args[:on]}.#{self.name.tableize}.maximum(:#{field}) + 1 : 0
end
def reorder_#{field}
self.#{args[:on]}.#{self.name.tableize}.order(:#{field} => :asc).each_with_index do |item, index|
item.update_column(:#{field}, index)
end
end
EOV
end
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